05000325/LER-1979-041-01, /01T-0 on 790525:certain Nylon Insulation Sleeve Portions of Compression Type Termination Lugs Did Not Meet Environ Qualification Tests.Each Drywell Termination Will Be Checked for Deterioration & Safety Assurance

/01T-0 on 790525:certain Nylon Insulation Sleeve Portions of Compression Type Termination Lugs Did Not Meet Environ Qualification Tests.Each Drywell Termination Will Be Checked for Deterioration & Safety Assurance

ML19289F650
Person / Time
Site:	Brunswick
Issue date:	06/08/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19289F648	List: 05000325/LER-1979-041, Forwards LER 79-041/01T-0 05000325/LER-1979-041-01, /01T-0 on 790525:certain Nylon Insulation Sleeve Portions of Compression Type Termination Lugs Did Not Meet Environ Qualification Tests.Each Drywell Termination Will Be Checked for Deterioration & Safety Assurance
References
LER-79-041-01T, LER-79-41-1T, NUDOCS 7906150241
Download: ML19289F650 (2)

LER-1979-041, /01T-0 on 790525:certain Nylon Insulation Sleeve Portions of Compression Type Termination Lugs Did Not Meet Environ Qualification Tests.Each Drywell Termination Will Be Checked for Deterioration & Safety Assurance

Event date:
Report date:
3251979041R01 - NRC Website

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RE POR T DAT E 80 EVENT DESCRIPTION AND PROBABt.E COT 5EQUENCES O'o IDuring the review of environmental qualification of electrical equipment for Unit Nos.

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l1 and 2 as required by IE Bulletin 79-01, it was found that certain nylon insulating g

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pleeve portions of the compression-type termination lugs, manufactured by AMP Special j

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The lug in question is ;

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LAMP Type PIDG for use with sizes 10 through 12 wiring.

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40 43 42 43 44 41 CAUSE DESCRIPTION AND CORRECTf W AcIlONS h l1 o lAn evaluation has been made of the possible problems which could result from the fail-l fure of the insulating sleeve.

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[ problems can only occur if the lugs were free to rotate underneath the terminal (cont.)]

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d LER CONTINUATION -- RO# 1-79-41 Facility: BSEP Unit No. 1 Event Date: 5/25/79 screws far enough to cause contact between adjacent lugs, rotation is not expected in the seismically qualified terminations used at Brunswick.

As an interim measure, each of the drywell terminations using the AMP sleeve is being inspected for deterioration of the existing sleeve; this inspection will also ensure that the wire is properly aligned to the terminal block cnd that the termination screw is tight. These actions provide assurance for the nearterm that plant operation may continue without undo risk to the public health and safety.

At the next refueling outage for each unit, we will implement a permanent solution to the problem. There are several possible permanent insulation devices which will be evaluated in the interim.

During the refueling outage, one of these solutions, or a combination of them, will be used to ef fect a permanent, fully qualified solution.

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